杭州翰天网络科技Word格式文档下载.doc
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A.4
B.5
C.6
D.7
4:
Whichdeclaresfornativemethodinajavaclasscorrected?
A.publicnativevoidmethod(){}
B.publicnativevoidmethod();
C.publicnativemethod();
D.publicvoidnativemethod();
5:
1.What
happens
when
you
try
to
compile
and
run
the
following
program?
2.class
Mystery{
3.String
s;
4.public
static
void
main(String[]
args){
5.Mystery
m=new
Mystery();
6.m.go();
7.}
8.void
Mystery(){
9.s=”constructor”;
10.}
11.void
go(){
12.System.out.println(s);
13.}
14.}
Whathappenswhenyoutrytocompileandrunthefollowingprogram?
classMystery{
Strings;
publicstaticvoidmain(String[]args){
Mysterym=newMystery();
m.go();
}
voidMystery(){
s=”constructor”;
voidgo(){
System.out.println(s);
A.thiscodecomplilesbutthrowsanexceptionatruntime
B.thiscoderunsbutnothingappearsinthestandardoutput
C.thiscoderunsand“constructor”inthestandardoutput
D.thiscoderunsandwrites”null”inthestandardoutput
6:
publicclassParent{
intchange(){…}
}
classChildextendsParent{
WhichmethodscanbeaddedintoclassChild?
A.publicintchange(){}
B.abstractintchang(){}
C.privateintchange(){}
D.none
7:
will
happen
attempt
code?
2.
3.public
class
Static
4.
5.{
6.
7.static
8.
9.{
10.
11.int
x
=
5;
12.
13.}
14.
15.static
int
x,y;
16.
17.public
main(String
args[])
18.
19.{
20.
21.
x--;
22.
23.
myMethod();
24.
25.
System.out.println(x
+
y
++x);
26.
27.}
28.
29.public
myMethod()
30.
31.{
32.
33.y
x++
++x;
34.
35.}
36.
37.}
38.
39.Choices:
Whatwillhappenwhenyouattempttocompileandrunthefollowingcode?
publicclassStatic
{
static
intx=5;
staticintx,y;
publicstaticvoidmain(Stringargs[])
x--;
myMethod();
System.out.println(x+y+++x);
publicstaticvoidmyMethod()
y=x+++++x;
Choices:
A.prints:
2
B.prints:
3
C.prints:
7
D.prints:
8
8:
Aclassdesignrequiresthataparticularmembervariablemustbeaccessiblefordirectaccessbyanysubclassesofthisclass.butotherwisenotbyclasseswhicharenotmembersofthesamepackage.Whatshouldbedonetoachievethis?
A.Thevariableshouldbemarkedpublic
B.Thevariableshouldbemarkedprivate
C.Thevariableshouldbemarkedprotected
D.Thevariableshouldhavenospecialaccessmodifier
9:
1.Give
code:
2.public
Example{
args[]
){
4.int
l=0;
5.do{
6.System.out.println(“Doing
it
for
l
is:
”+l);
7.}while(--l>
0)
8.System.out.println(“Finish”);
9.}
11.Which
well
be
output:
Givethefollowingcode:
publicclassExample{
publicstaticvoidmain(Stringargs[]){
intl=0;
do{
System.out.println(“Doingitforlis:
}while(--l>
0)
System.out.println(“Finish”);
Whichwellbeoutput:
A.Doingitforlis3
B.Doingitforlis1
C.Doingitforlis2
D.Doingitforlis0
10:
假定a和b为int型变量,则执行下述语句组后,b的值为
a=1;
b=10;
do
{
b-=a;
a++;
}while(b--<
0);
A.9
B.-2
C.-1
D.8
11:
WhichfragmentsarenotcorrectinJavasourcefile?
A.packagetestpackage;
publicclassTest{//dosomething...}
B.importjava.io.*;
packagetestpackage;
publicclassTest{//dosomething...}
C.importjava.io.*;
classPerson{//dosomething...}publicclassTest{//dosomething...}
D.importjava.io.*;
importjava.awt.*;
12:
this
outline:
3.private
x;
4.//rest
of
body…
5.}
6.Assuming
that
invoked
by
code
java
Example,
which
statement
can
made
directly
accessible
in
main()
method
Example.java?
Givethisclassoutline:
classExample{
privateintx;
//restofclassbody…
AssumingthatxinvokedbythecodejavaExample,whichstatementcanmadexbedirectlyaccessibleinmain()methodofExample.java?
A.Changeprivateintxtopublicintx
B.changeprivateintxtostaticintx
C.Changeprivateintxtoprotectedintx
D.changeprivateintxtofinalintx
13:
Inth